Don't Get Hung Up on One Social Media Outlet
The tools of today may not be the tools of tomorrow. The Web is ever changing.
That's why it's important not to get too bogged down in any one type of marketing -- online or otherwise. It's great to get involved in online communities, but don't let it eat up all your time and become the only type of marketing you do.
It's fine to use Facebook, Twitter or other sites, but don't invest too much into only those things. As quickly as those outlets popped up on the web, others may pop up just as fast. The key is flexibility.